I've never seen a book about RS-422, I learned what I know about it from a
422 serial card's manual and little bits and pieces here and there. One
thing I can tell you about it's differences from 232C is that 422 is only
an electrical specification and performance requirements, no
signal/connector assignments.
RS-422 uses a twisted pair for the signals and senses a 5V _differential_
between the 2 conductors. Specified length is 4000 feet.
RS-485 specifies the connections for multidropping up to 32 ports on one
line, and is built upon 422's 5V twisted pair. Most 422 cards I've seen are
also 485-capable, whether advertised as such or not.
There's also an RS-four-ninety-something that adds the signal and connector
specifications, if memory serves it uses something like a 39-pin D-shell
with an optional D-shell for additional signals. Never did see a pinout on
it though.
The only reference given was the original IEEE documentation.